METHOD FOR REMOVING UNWANTED MATTER FROM AN AQUEOUS PAPER FIBER SUSPENSION USING AT LEAST ONE FLOTATION INSTALLATION

摘要

The invention relates to a method for removing unwanted matter from an aqueous paper fiber suspension (S) using at least one flotation installation. The flotation foam formed during flotation is introduced into a degassing unit (18) and is set rotating using a rotor (3). The foam attached to the inner wall (2) of the degassing unit (18) in the form of a liquid ring (13) and is discharged as a partially degassed flotation foam (1') through an outlet (8) in the inner wall (2). The invention provides a method for the subsequent treatment of a partially degassed flotation foam (1') in a more economic manner.